Many researchers thought the worlds orbiting the star TRAPPIST-1 would have thick atmospheres, but new observations of one of them show that it doesn’t
was far brighter than the researchers expected, indicating that the sunlight was hitting one side of the planet and not being absorbed by a thick atmosphere. The temperature of that side of the planet, called the day side, was about 230°C , about 100 degrees hotter than we would expect if there were an atmosphere distributing the heat around the globe.
The most likely explanation is that this planet’s atmosphere was lost soon after its formation, when the star was brightest, or thatstripped it away. “There’s a lot of energy getting dumped onto the planets, and that can do bad things to atmospheres,” says Greene. “There are probably important interactions between the star and the planets – it’ll be really interesting when we look at the results for the whole system.”Voyage across the galaxy and beyond with our space newsletter every month.
and whether they might be amenable to life, which is important because they are the most abundant type of stars in the universe and are expected to host the vast majority of exoplanets.
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